Commit-ID: 88c8004fd3a5fdd2378069de86b90b21110d33a4 Gitweb: http://git.kernel.org/tip/88c8004fd3a5fdd2378069de86b90b21110d33a4 Author: Colin Cross <[email protected]> AuthorDate: Wed, 1 May 2013 18:35:05 -0700 Committer: Thomas Gleixner <[email protected]> CommitDate: Tue, 25 Jun 2013 23:11:19 +0200
futex: Use freezable blocking call Avoid waking up every thread sleeping in a futex_wait call during suspend and resume by calling a freezable blocking call. Previous patches modified the freezer to avoid sending wakeups to threads that are blocked in freezable blocking calls. This call was selected to be converted to a freezable call because it doesn't hold any locks or release any resources when interrupted that might be needed by another freezing task or a kernel driver during suspend, and is a common site where idle userspace tasks are blocked. Signed-off-by: Colin Cross <[email protected]> Cc: Rafael J. Wysocki <[email protected]> Cc: [email protected] Cc: Tejun Heo <[email protected]> Cc: Oleg Nesterov <[email protected]> Cc: Darren Hart <[email protected]> Cc: Randy Dunlap <[email protected]> Cc: Al Viro <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Thomas Gleixner <[email protected]> --- kernel/futex.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/futex.c b/kernel/futex.c index 49dacfb..c3a1a55 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -62,6 +62,7 @@ #include <linux/ptrace.h> #include <linux/sched/rt.h> #include <linux/hugetlb.h> +#include <linux/freezer.h> #include <asm/futex.h> @@ -1808,7 +1809,7 @@ static void futex_wait_queue_me(struct futex_hash_bucket *hb, struct futex_q *q, * is no timeout, or if it has yet to expire. */ if (!timeout || timeout->task) - schedule(); + freezable_schedule(); } __set_current_state(TASK_RUNNING); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
